Golf ball

Abstract

An object of the present disclosure is to provide a golf ball having excellent stability on an approach shot around the green while maintaining or improving a flight distance on a driver shot for a golfer with a slow head speed. The present disclosure provides a golf ball comprising a spherical core, and an outermost cover positioned outside the spherical core and having a plurality of dimples formed thereon, wherein when a hardness difference S (=Hs−Ho) between a surface hardness Hs of the spherical core and a center hardness Ho (Shore C hardness) of the spherical core, a material hardness C (Shore D hardness) of the outermost cover, and a total volume V (mm 3 ) of the plurality of dimples below a surface of a virtual sphere satisfy V+S×C≤1200.

1 . A golf ball comprising a spherical core, and an outermost cover positioned outside the spherical core and having a plurality of dimples formed thereon, wherein
 a hardness difference S (=Hs−Ho) between a surface hardness Hs of the spherical core and a center hardness Ho (Shore C hardness) of the spherical core,   a material hardness C (Shore D hardness) of the outermost cover, and   a total volume V (mm 3 ) of the plurality of dimples below a surface of a virtual sphere is V (mm 3 ) satisfy V+S×C≤1200.   
     
     
         2 . The golf ball according to  claim 1 , wherein Vi−Vo≤0 is satisfied, where Vo is a total upper volume of the dimples, Vi is a total lower volume of the dimples and V=Vo+Vi. 
     
     
         3 . The golf ball according to  claim 1 , wherein S+C≤60 is satisfied. 
     
     
         4 . The golf ball according to  claim 1 , wherein the cover contains an ionomer resin. 
     
     
         5 . The golf ball according to  claim 1 , wherein the total volume V of the plurality of dimples ranges from 400 mm 3  to 800 mm 3 . 
     
     
         6 . The golf ball according to  claim 1 , wherein the hardness difference S ranges from 0 to 35 in Shore C hardness. 
     
     
         7 . The golf ball according to  claim 1 , wherein the surface hardness Hs of the spherical core ranges from 60 to 95 in Shore C hardness. 
     
     
         8 . The golf ball according to  claim 1 , wherein the center hardness Ho of the spherical core ranges from 30 to 70 in Shore C hardness. 
     
     
         9 . The golf ball according to  claim 1 , wherein the material hardness C of the outermost cover ranges from 20 to 65 in Shore D hardness. 
     
     
         10 . The golf ball according to  claim 1 , wherein S, C, and V satisfy 300≤V+S×C≤1200. 
     
     
         11 . The golf ball according to  claim 2 , wherein −100≤Vi−Vo is satisfied. 
     
     
         12 . The golf ball according to  claim 3 , wherein 30≤S+C is satisfied. 
     
     
         13 . The golf ball according to  claim 1 , wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, and (c) a crosslinking initiator. 
     
     
         14 . The golf ball according to  claim 13 , wherein the rubber composition further contains (g) a terpene-based resin. 
     
     
         15 . The golf ball according to  claim 14 , wherein an amount of (g) the terpene-based resin ranges from 0.5 part by mass to 10 parts by mass with respect to 100 parts by mass of (a) the base rubber.